I have been using the free version of this app for a long time and I like it so much that I decided to go pro. The constant & conversion customisation is awesome. BUT can we have an option to change back to the non-pro key layout? I couldn't care less about degree/minute/second conversion and fraction but often use the x^2 button. I would like to be able to access it without the shift key. Another feature request: stat mode to calculate sum, squared sum, stdev and the like on a set of entered values.
I used the free version of this calculator for quite a while because the one that came with my phone didn't do everything I wanted. After a long time I realised I still hadn't found anything to criticise, so I decided to show my appreciation and pay for it. Not only am I able to do trigonometry (yes, some of us do actually use that crazy stuff we learned at school!), it will also do all the conversions I need which I find really useful. Another feature I find handy is being able to to look back at recent answers, and the older I get, the more I use it. I sincerely recommend this app.
Easily the best calculator I have. I've given up my HP50g and trusty TI85 and use this exclusively. Advanced calculators aren't that useful because anything past what this app can do is done on my computer anyway. It has a comfortable UI and works in RPN, which sold me. Customizable conversions are easily worth the purchase price.
This is one of the first apps I ever paid actual money for. Years ago... This is also one if the first few apps installed after upgrading my phone or tablet. This was also the very first app that made me want family sharing before it was a "thing". Its perfectly awesome and I've never ran into a bug. Buy it...now!
I got my first calculator over 40 years ago. This is by far the best. Not as many functions as some but a very well chosen set. Configurable where it matters, you can't reskin it (it looks good as is) but you can do things like adjusting the keyboard feedback. One of the very few paid for apps that are great value for money.
The best calc on Android. I've been using the free version for a while and didn't really need the extra functions of the Plus version, but fair's fair - this is a great piece of work and I'm happy to pay the developer for it. There is no need to own a scientific calculator if you have this app.
* Homescreen widget now supports RPN (follows app by default, can be changed in settings).
* New delta-percent function.
* Support for Android 6.0 Marshmallow.
* Fixed possible crash on a few devices running 5.1 (Jiayu S3, Lenovo K3 Note).
Excellent scientific calculator with expressions, fractions, repeating decimals.